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SD45 locomotives
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I'd guess you can do much the same things as you would with a smaller diesel power unit. If it has a turbo the usual technique is to fit a larger intercooler (cooler air = higher density = more oxygen) and a large free-flowing exhaust system. You can also turn the turbo boost pressure up though this is risky as it can reduce engine and/or component life - it's only worth trying in combination with other modifications usually. Other options include switching to metal cylinder head gaskets, though I'm unsure if that would work on a big diesel. After that it's a case of optimising the fuelling to get the best power from the engine, and possibly spending more time on maintainance - merely changing the oil can give you something of a boost as old oil tends to thicken.
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